Centaurea nigra
PNW
BC
ID
MT
OR
WA
55 specimens from 13 herbaria:
British Columbia (9)
Idaho (5)
Montana (11)
Oregon (19)
Washington (11)
29 images from 9 herbaria:
HPSU (2)
IDE (5)
MONT (3)
MONTU (8)
PSM (1)
SOC (1)
UBC (2)
WTU (5)
WWB (2)